# P0420 on the 1999 Honda Civic

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

## Bulletins for this model year that name P0420

- [10017639](https://open.wenmarpro.com/bulletins/10017639), 2005-11-15: MALFUNCTION INDICATOR LAMP ON WITH DIAGNOSTIC TROUBLE CODE P0420 OR ENGINE PING UNDER LOAD. \*TT
- [10009189](https://open.wenmarpro.com/bulletins/10009189), 2004-09-16: \(COMPLETE\) DISTRIBUTOR ASSEMBLY. HESITATION, PINGING AND/OR REPEAT DIAGNOSTIC TROUBLE CODE P0420 \(CATALYST\) PROBLEMS. REQUEST FOR PARTS. \*TT
- [627496](https://open.wenmarpro.com/bulletins/627496), 2002-02-08: SUBJECT REGARDING DIAGNOSTIC TROUBLE CODE P9999 PROBABLY BEING DIAGNOSTIC TROUBLE CODE P0420. \*SLC